Zero-Day Vulnerability Patched in Fortinet Software

Summary

A vulnerability has been disclosed in FortiOS and FortiProxy. The vulnerability is categorized as CVE-2024-21762 and has a 9.6 (Critical) CVSS score. The vulnerability allows for a remote unauthenticated attacker to craft HTTP requests to execute unexpected or unauthorized code or commands. This vulnerability has been added to CISA’s known exploited vulnerabilities catalog. This was[DFR1]  a zero-day vulnerability, it is under active exploitation and needs to be fixed as soon as possible.

Impact Assessment

Exploitation of this vulnerability can allow an attacker to execute unauthorized code or commands. If they are successful, it can lead to considerable risk to confidentiality, integrity, and availability.

Affected Software

FortiProxy 1.0 - 1.2 all versions, FortiProxy 2.0-2.0.13, FortiProxy 7.0-7.0.14, FortiProxy 7.2-7.2.8, FortiProxy 7.4-7.4.2

FortiOS 6.0, FortiOS 6.2.0 - 6.2.15, FortiOS 6.4.0 - 6.4.14, FortiOS 7.0.0 - 7.0.13, FortiOS 7.2.0 - 7.2.6, FortiOS 7.4.0 - 7.4.2

What It Means for You

Check If your organization uses FortiProxy or FortiOS software. If so, follow remediation steps.

Remediation

FortiOS 6.2-FortiOS 7.4 all have upgrades. FortiProxy 2.0-7.4 all have upgrades. Please refer to the vendor’s advisory (FG-IR-24-015) for specific version numbers.

There is a workaround available to disable SSL VPN.

Business Implications

FortiOS and FortiProxy are both used as security tools for a company. If these are compromised, there can be significant monetary loss, regulatory issues, reputational loss etc. This can result in incident response, data exfiltration, and installation of malware as a few examples.

Access Point Technology Recommends

Patch: Patching both FortiOS and FortiProxy to the versions that are indicated in the advisory (FG-IR-24-015) to mitigate this vulnerability.  

Apply Workaround: Workaround is available to disable SSL VPN, only do this if there is an alternative available as it can be disruptive to the business.

Associated Bulletins

https://www.fortiguard.com/psirt/FG-IR-24-015

https://nvd.nist.gov/vuln/detail/CVE-2024-21762

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

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